期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 6, 期 30, 页码 8003-8010出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc02419g
关键词
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资金
- National Science Foundation [DMR-1403929, DMR-1705707]
- National Natural Science Foundation of China [51272132, 11774046]
- China Scholarship Council
It is general knowledge in persistent luminescence that high-energy illumination, mostly ultraviolet light, is usually necessary in order to effectively charge persistent phosphors. However, the need for high-energy ultraviolet light excitation compromises some applications. In his pioneering work on ruby (Al2O3:Cr3+) laser materials in 1960, Theodore Maiman observed an excited-state absorption phenomenon under the excitation of a high-intensity green-light flash tube. Inspired by Maiman's observation, here we propose a new two-photon up-conversion charging (UCC) concept to effectiveLy charge Cr3+-activated near-infrared persistent phosphors using low-energy, high-intensity visible-light Laser diodes. As an example, we demonstrate that a low-energy 635 nm Laser diode can produce persistent luminescence in the LiGa5O8:Cr3+ persistent phosphor at the same magnitude as that produced by high-energy 335 nm ultraviolet light from a xenon arc lamp. Moreover, the UCC appears to be a common phenomenon in persistent phosphors containing other UCC-enabling activators such as rare-earth Pr3+ ions and transition metal Mn2+ ions. The UCC technique offers a new way to study persistent luminescence and utilize persistent phosphors; for instance, in bioimaging it makes effective in vivo charging persistent optical probes using tissue-friendly visible Light possible.
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